SynopsisIn low-density polyethylene containing the additive propylfluorancene, radiation energy received by polyethylene is transferred to propylfluorancene, and the production of radicals at 77 K in polyethylene is suppressed. Propylfluorancene also increases the rate of the decay of radicals of polyethylene at room temperature. The depression of radical production and acceleration of radical decay at room temperature results in the depression of gas production and crosslinks at room temperature in low-density polyethylene containing propylfluorancene. Similar results were obtained in ethylene-propylene copolymer containing the same additive.